获取百度地图可视区域左下角和右上角的坐标
map.addEventListener("dragend", function () {
var bs = map.getBounds(); //获取可视区域
var bssw = bs.getSouthWest(); //可视区域左下角
var bsne = bs.getNorthEast(); //可视区域右上角
alert("当前地图可视范围是:" + bssw.lng + "," + bssw.lat + "到" + bsne.lng + "," + bsne.lat);
});